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These resources have been reviewed and selected by STEM Learning’s team of education specialists for factual accuracy and relevance to teaching STEM subjects in UK schools.

# Straight Line Graphs Mystery

This resource created by Shirley Fall has twenty mystery fact cards, each containing a statement about the features of straight line graphs and how they lie on a 3 by 3 grid. The rationale is for students to use the fact cards to discover the features of each graph - its gradient, its intercept, its graph and ultimately its equation - by discussing the possible options and working towards a solution of which straight line graph lies in each grid cell

*Task 1A - Use the cards to determine the gradients and intercepts on the y axis and thus the sketches of the graphs in each of the cells.

*Task 1B - Using the equation cards (E1-14) find, where possible, equivalent expressions to create matching pairs/groups.

*Task 1C - If the equation cards E1 - E14 are labels for each of the nine graphs in Task 1A, produce a 3 by 3 grid containing detailed, labelled sketches on which the co-ordinates of key points are identified.

Supporting worksheets:

*a blank grid;

*a grid of blank axes;

*a grid that prompts the student for the gradient, y intercept and graph;

*a grid that prompts the student for the equation; It is recommended that the grids are enlarged to A3 size.

The Equation cards are available as a separate file.

Teachers' notes:

*Suggested vocabulary;

*Concepts, knowledge and skills covered;

*A possible lesson structure;

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